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Loans and allowance for credit losses - Amount of Loans by Loan Class of Financing Receivable Individually and Collectively Evaluated for Impairment (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Individually evaluated for credit loss/impairment | $ 38,205 |  | $ 23,810 | $ 13,716
Collectively evaluated for credit loss/impairment | 6,329,868 |  | 4,328,680 | 3,584,796
Loans | 7,082,959 | $ 4,409,642 | 4,409,642 | 3,667,511
Purchased Credit Impaired loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Collectively evaluated for credit loss/impairment | 714,886 |  | 57,152 | 68,999
Loans |  |  | 57,152 |
Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Individually evaluated for credit loss/impairment | 15,578 |  | 9,026 | 1,847
Collectively evaluated for credit loss/impairment | 1,270,058 |  | 1,023,326 | 863,788
Loans | 1,346,122 |  | 1,034,036 | 867,083
Commercial and industrial | Purchased Credit Impaired loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Collectively evaluated for credit loss/impairment | 60,486 |  | 1,684 | 1,448
Loans |  |  | 1,684 |
Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Individually evaluated for credit loss/impairment | 4,851 |  | 2,061 | 1,221
Collectively evaluated for credit loss/impairment | 1,140,634 |  | 546,156 | 549,075
Loans | 1,222,220 |  | 551,101 | 556,051
Construction | Purchased Credit Impaired loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Collectively evaluated for credit loss/impairment | 76,735 |  | 2,884 | 5,755
Loans |  |  | 2,884 |
Residential real estate | 1-to-4 family mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Individually evaluated for credit loss/impairment | 848 |  | 1,347 | 987
Collectively evaluated for credit loss/impairment | 987,142 |  | 689,769 | 535,451
Loans | 1,089,270 |  | 710,454 | 555,815
Residential real estate | 1-to-4 family mortgage | Purchased Credit Impaired loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Collectively evaluated for credit loss/impairment | 101,280 |  | 19,338 | 19,377
Loans |  |  | 19,338 |
Residential real estate | Residential line of credit |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Individually evaluated for credit loss/impairment | 412 |  | 579 | 245
Collectively evaluated for credit loss/impairment | 387,250 |  | 220,878 | 190,235
Loans | 408,211 |  | 221,530 | 190,480
Residential real estate | Residential line of credit | Purchased Credit Impaired loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Collectively evaluated for credit loss/impairment | 20,549 |  | 73 | 0
Loans |  |  | 73 |
Residential real estate | Multi-family mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Individually evaluated for credit loss/impairment | 0 |  | 0 | 0
Collectively evaluated for credit loss/impairment | 156,447 |  | 69,429 | 75,457
Loans | 175,676 |  | 69,429 | 75,457
Residential real estate | Multi-family mortgage | Purchased Credit Impaired loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Collectively evaluated for credit loss/impairment | 19,229 |  | 0 | 0
Loans |  |  | 0 |
Residential real estate | Non-owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 1,598,979 |  |  |
Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 924,841 |  |  |
Commercial real estate | Owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Individually evaluated for credit loss/impairment | 7,846 |  | 2,993 | 2,608
Collectively evaluated for credit loss/impairment | 813,151 |  | 621,386 | 484,900
Loans | 924,841 |  | 630,270 | 493,524
Commercial real estate | Owner occupied | Purchased Credit Impaired loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Collectively evaluated for credit loss/impairment | 103,844 |  | 5,891 | 6,016
Loans |  |  | 5,891 |
Commercial real estate | Non-owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Individually evaluated for credit loss/impairment | 8,631 |  | 7,755 | 6,735
Collectively evaluated for credit loss/impairment | 1,272,203 |  | 902,792 | 677,247
Loans | 1,598,979 |  | 920,744 | 700,248
Commercial real estate | Non-owner occupied | Purchased Credit Impaired loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Collectively evaluated for credit loss/impairment | 318,145 |  | 10,197 | 16,266
Loans |  |  | 10,197 |
Consumer and other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Individually evaluated for credit loss/impairment | 39 |  | 49 | 73
Collectively evaluated for credit loss/impairment | 302,983 |  | 254,944 | 208,643
Loans | 317,640 |  | 272,078 | 228,853
Consumer and other | Purchased Credit Impaired loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Collectively evaluated for credit loss/impairment | $ 14,618 |  | 17,085 | $ 20,137
Loans |  |  | $ 17,085 |

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